Many people commented this too, I need to balance the game before getting The Mind since I've not calculated it well. Surely, I'll use a new mechanic related to stardust to improve this. Ghank you for your feedback!
I'd recommend giving the player more things to do with the energy, as I currently have billions stockpiled and I'm less than halfway to affording the sun
Maybe since the mind improves live/sp/ai gain, the energy could improve prestige gain?